Transformer on-load tap-changer mechanical condition monitoring method

An on-load tap, mechanical state technology, applied in the testing of mechanical components, testing of machine/structural components, instruments, etc., can solve problems such as increased failure rate

Active Publication Date: 2019-03-08
GUIZHOU POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the increase in the number of voltage adjustments of the on-load tap changer, its failure rate also increases

Method used

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  • Transformer on-load tap-changer mechanical condition monitoring method
  • Transformer on-load tap-changer mechanical condition monitoring method
  • Transformer on-load tap-changer mechanical condition monitoring method

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Embodiment Construction

[0071] A method for monitoring the mechanical state of a transformer on-load tap changer, which comprises the following steps:

[0072] (1) Collect the vibration signal x(t) during the switching process of the transformer on-load tap changer, and its length is N;

[0073] (2) calculate the embedding dimension m of vibration signal x (t), the calculation process of described embedding dimension m is

[0074] 2a. Calculate the standard deviation σ of the vibration signal x(t);

[0075] 2b. The vibration signal x(t) is divided into t disjoint subsequences, the length l of each subsequence is l=N / t;

[0076] 2c. For each subsequence, calculate three statistics and S cor (t), for

[0077]

[0078]

[0079]

[0080]

[0081]

[0082] ΔS(m,r,t)=max[S(m,N,r i ,t)]-min[S(m,N,r j ,t)], i≠j

[0083]

[0084] d ij =||X(i)-X(j)||

[0085]

[0086] In the formula, H(r) is the Heaviside step function; r is the radius (the search radius taken in the calculation)...

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Abstract

The invention discloses a transformer on-load tap-changer mechanical condition monitoring method. The method includes collecting a vibration signal during the switching of a transformer on-load tap-changer; calculating the embedding dimension of the vibration signal; calculating the scale factor of the vibration signal, and performing coarse graining processing on the vibration signal so that a reconstruction matrix can be obtained; performing dimensionality reduction and decomposition on the reconstruction matrix; performing symbolization and coding processing on the row vector in the reconstruction matrix after dimensionality reduction so that the shape characteristic sequence of the vibration signal can be obtained; and calculating the similarity of the shape characteristic sequence ofthe vibration signal of a to-be-detected tap-changer and the shape characteristic sequence of a history vibration signal, and judging the mechanical condition of the tap-changer through the similarity. The method can effectively and highly sensitively monitor the mechanical conditions of transformer on-load tap-changers on line, and therefore, the timely overhaul or replacing of the tap-changers can be realized, and the operation reliability of the tap-changers and transformers can be enhanced.

Description

technical field [0001] The invention relates to the field of monitoring the mechanical state of a tap changer, in particular to a method for monitoring the mechanical state of a transformer on-load tap changer. Background technique [0002] The transformer is one of the most important equipment in the power system, and its operation stability has a great influence on the safe and stable operation of the power system. The on-load tap-changer is the only movable part of the on-load transformer. Usually under load conditions, the uninterrupted voltage regulation of the power system is realized by changing the voltage ratio, which plays a role in compensating voltage fluctuations, regulating power, improving system performance and improving power. important role in quality. However, with the increase of the voltage regulation times of the on-load tap changer, its failure rate also increases. The faults of on-load tap-changers mainly include electrical faults and mechanical fau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00
CPCG01M13/00
Inventor 陈沛龙黄军凯胡兴海余思伍马晓红张迅刘君牧灏许逵曾鹏杨涛
Owner GUIZHOU POWER GRID CO LTD
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